Lock



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LOCK

Filed April 9, 1931 Patented Apr. 25, 1933 UNITED STATES PATENT OFFICEEDWARD N. JACOBI, 0F MILWAUKEE, WISCONSIN, ASSIGNOR T0 BRIGGS STBATTONCORPORATION, OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN LOCKApplication led April 9,

This invention relates to certain new and useful improvements in locksand refers more particularly to locks of the general type illustrated inmy copending application 5 Serial No. 528,823 and in which the lockcylinder is removably mounted in the mounting head.

In locks having removable cylinders it has been difficult to protect theexposed end portion of the cylinder a ainst destruction and it is,therefore, an obJect of this invention to provide a lock of thecharacter described which is equipped with adequate means for resistingdestruction of its cylinder.

Another object of this invention resides in the provision of aprotecting member for the exposed end of the lock cylinder which alsoserves as part ofthe means for removably securing the lock cylinder inits mounting head.

Another object of this invention resides in the provision of a novelbolt structure which normally retains an element engaged over the outerend of the lock cylinder against removal from the mounting head andwhich, upon movement ofthe lock cylinder beyond one of its normal limitsof movement by means of a special key releases said member andconsequently the lock cylinder for removal.

And a more specific object of this invention resides in the provision ofa protecting cap formed of hardened metal and engaged over the exposedend of the lock cylinder and having a portion extending rearwardly forengagement by the locking bolt of the lock structure whereby theprotecting cap is normall maintained assembled with the mounting liieadand is removable therefrom-to permit withdrawal of the lock cylinderupon movement of the locking bolty beyond one of its normal limits ofmovement. J

With the above and other objects in view which will appear as thedescription proceeds, my invention resides in the novel construction,vcombination and arrangement of parts substantial] as hereinafter de,-

59 scribed and more particularly defined by the 1931. Serial N0.528,824.

of a lock structure embodying my invention;

' Figure 2 is a transverse sectional view taken through Figure 1 on theplane of the line 2 2; f

v Figure 3 is a transverse sectional view taken through Figure 1 on theplane of the line 3 3;

Figure 4 is a view similar to Figure 3, but illustrating the lockingbolt in its full retracted position permitting removal o the lockcyllnder;

Figure 5 is a top plan view of the mounting head and lock cylinderremoved from the supporting casing, said view being taken on the planeof the line 5-5 of Figure 1 with portions thereof broken away and insection to illustrate structural details; and

Figures 6 and 7 are side elevations of a re ular and special key,respectively.

eferring now more particularly to the accompanying drawing in which likenumerals designate like parts throughout the severall views, the numeral`l0 represents the mounting head of a lock structure embodying-thisinvention, which is longitudinally bored, as at 11 to receive a lockcylinder 12 inserted therein from one end. The lockifif inder 12 is ofmore or less conventional con??4 struction and is equipped withaplurality of locking tumblers whichv are ,yieldably' urged to projectone end into one of apa1r of diametrically opposite longitudinal .tum-Ibler receiving grooves 14 formed ini-115 mounting head in communicationwith'fts bore 11. f'

The tumblers 13 are retractible within the lock cylinder by theinsertion of a proper key 15 into the key slot 16 of the lock cylinderto free the lock cylinder for rotation. Rotation of the lock cylinder isadapted to impart longitudinal motion to a locking bolt 17 at the innerend of the lock cylinder, the lock cylinder being provided with aneccentric cam 18 projected from its inner end for the purpose oftransmitting motion to the locking bolt, as will be later described.

The locking bolt is slidably mounted in a transverse groove or slot 19formed in the inner end portion of the mounting headl and is yieldablyurged, by means of an ex pansive spring 20 confined between a medialportion of the locking bolt and a cup member 21 detachably disposed inan opening 22 in the wall of the mounting head'in line with the lockingbolt, to project its outer end portion 2 3 beyond the surface of themounting head. The projected end 23 of the locking bolt passes throughan` opening 24 in a rearward extension 25 on a protecting cap 26 enga edover theouter end ofthe mounting hea and adaptedto removably secure thelock cylinder in the mounting head in a manner to be later described,and projects beyond the surface of the rearward extension 25, which isHush with and forms a continuation of the cylindrical outer surface ofthe mounting head, to extend into an opening 27 formed in a supportingcasing or tube28. With the locking bolt thus projected into the opening27, the movement of the mounting head and lock cylinder within thesupporting casing is prevented, and upon withdrawal of the locking boltout of the opening 27, the mounting head and lock cylinder, whichcomprisesrthe lock structure per se, is free to be bodily moved axiallywithin the supporting casing or tube 28. A

Longitudinal or axial movement of the lock structure may be effected inany manner to produce any desired action and in the present instance anexpansive spring 29 mounted within the supporting casing 28 inwardly ofthe' vlock structure at all times yieldably urgesthe lock structureoutwardly of the casing so that upon disengagement of the locking boltfrom the supporting casing opening 27 outward movement of the lockstructure takes place. This outward movement, which is broughtabout bythe action of the spring 29, may be transmitted to any desired mechanism(not shown) by means of a wire 30 or the like, and is limited by theextension of the spring-cup 21 into an elongated opening or slot 31 inthe supporting casin The lock cyinder is retained against longitudinalmovement in the mounting head to maintain its eccentric cam in properrelation to the locking bolt, in an inward direction by the engagementof an enlarged head or annular flange 35 on the front end of thecylinder with a. shoulder 36 formed by counterboring the outer end ofthe mounting head bore 11, as at 37. Outward movement of the lockcylinder is prevented by the protecting gap 26 which is engaged over itsouter end portion and over the adjacent outer end portion of themounting head, the protecting cap being removably secured onthe-mounting head by the extension of the locking bolt end 23 throughthe opening 24v inthe rearward extensions 25 of the protecting cap.

The protecting cap may be stamped from a single blank of hardened metalor its outer end may be closed by a separate disc 33 annularly flangedto engage behind an annular flange 32 on the cylindrical portion of thecap. The disc 33 covers the outer end of the lock cylinder and to permitthe insertion of a key into the lock cylinder, the disc is provided withan opening 34 in register with the key slot 16. f

As hereinbefore stated, the rearward extension 25 of the protecting caplies flush with the outer cylindrical surface of the adjacent portion ofthe mounting head and in like manner the entire protecting cap is of thesame diameter as that of the mounting head so that upon retraction ofthe locking bolt by actuation of the lock cylinder, the lock structureis freely movable in the supportin casing.

:The loc -ing bolt 17, as best illustrated in Figures 3 and 4, has anenlarged medial portion 38 having one side edge arcuate to conform tothe cylindrical shape of the lock cylinder and engage the surface of thebore 1l. At its o posite side, the medial portion 38 has an ogsetextension 39 which lies in the path of the eccentric cam 18 and at itsbottom it is bifurcated to provide a pair of spaced arms 40 and `41. Thearm 40 forms part of the offset extension`39 and the arm 41 provides ashoulder 42 at its juncture with the arcuate side edge which is normallyengaged with a shoulder 43 formed at the juncture of the slot 19y withthe bore 11.

It is noted that the outer side edge of the arm 41 diverges from theadjacent side of the slot 19 in a downward direction so that rotation ofthe lock cylinder causes the lookin bolt to rock about the longitudinalaxis o the cylinder until the said outer side edge of the arm 41 engagesthe adjacent `side of the slot after which continued rotation of thelock cylinder imparts longitudinal motion to the locking bolt. Therocking action of the bolt effects the disengagement of a lateral lug`44 on the locking bolt outer lend portion 23 from a position over oneedge of the opening 24 in the protecting ca extension 25.

he enga ement of the lateral lug 44 over the ed e o the opening 24precludes the possibilit of the bolt being operated by means o a sharpimplement inserted into 27, but not out o the key slot while thecylinderis in locked position and thus necessitates the use of a properkey to retract the locking bolt out ofa supportin casing openin 27 tofree the lock cylinder for longitu inal movement. .p p Y ,During normaloperation of the lock, the rotation of the lock cylinder is limited to adegree" suilicient to draw the locking bolt on y out of the su portingcasing opening the opening 24 in the protecting cap extension 25 andthis limit of rotational movement on the art of the lock is bron htabout by means o a ke controlled locklng lug 45. The locking lug iscarried by a spring member 46 xed to the enlarged head 35 of the lockcylinder and cooperates with an abutment 47 formed on the mountingheadin communication with its counterbore 37. The spring member 46, asclearly shown in Figure 2, is mounted in a slot 48 extending partiallyaround the enlarged head 35 with one end firmly anchored therein and itsother end, which carries the lug 45, free to move longitudinally withrespect to the axis of the lock cylinder.

The resiliency of the spring member 46 normally maintains the lockinglug 45 out of the path of the abutment 47, but the regular key 15 isprovided with a shoulder 49 (see Figure 6) which engages the free end ofthe spring member and moves the locking bolt into the path of theabutment 47 so that rotation of the lock cylinder to withdraw thelocking bolt from operative position is limited.

When it is desired to remove the lock cylinder, a special key 50, shownin Figure 7 in which the shoulder 49 is omitted, is employed. This keyretracts the tumblers `as, does the key 15, but does not project thelocking lug 45 into the path o the abutment 47 so that rotation of thelock cylinder beyond its normal limit is permitted and such additionalrotation carries the locking bolt to its fully retracted positionillustrated Vin Figure 4 permitting withdrawal of the protecting cap andconsequently the lock cylinder. i Y

From the foregoing description taken in connection with the accompanyingdrawing, it will be readily apparent to those skilled'in the art towhich an invention of the character described appertains, that I What Iclaim as my invention is:

1. In a lock structure, including a mounting head and a lock cylindermounted therein, a protecting element engagedy over the exposedend'portions of thelock cylinder and mounting head to removably securethe lock cylinder in the mounting head, and

means operable b actuation of the lock cylthe mounting head uponretraction of the tumblers, means for removably securing the lockcylinder in the mounting head compris# ing a protecting element engagedover the exposed portion of the lock cylinder, and a locking boltoperable by thelo'ck cylinder and engaged with said protecting elementto hold the same in position. y

3. In a lock structure of the character dei scribed, comprisingamounting head and a lock cylinder removably mounted therein, a i

protecting element engaged over the exposed end of the lock cylinder toretain the same'in' the .mounting head, a locking bolt operable` uponactuation of the lock cylinder and a' releasable connection between vthebolt and said protecting element.

4. In a lock structure including a inc'ninting-headand a key operablelock cylinder' mounted therein, an element engaged 'over a portion'l ofthe lock cylinder and the m'ount- 1. 0

lng head for removably securing'the lock cylinder in the mounting'head,alockng' bolt operable upon actuationof the lock cyl! inder, andanoperative connection between the lockingbolt and said element tonormally secure said element assembled with the mounting head. i

5. In a lock structure includin a mount-l" ing head, a' key operable loccylindervv mounted therein, alockng bolt having a p rel 1 l5 determinedmovement during normal 'actua' tion of the lock cylinder, means wherebythe] locking bolt removably secures the lock c 1 locking V ibo inder inthe mounting head, said means operated means normally preventin movementof the lock cylinder to said position.

ingl disabled by movement Vofthe lock cyl'- 1n er to a predeterminedposition, and key 6. In a lockstructure includin a mount-fl ing head anda key operable loc cylinder `mounted therein, a locking bolt operableupon actuation of the loc means normally engaged "foy the clocking,

bolt for removabl securing thelock cylinder in the mounting ead, saidlockinguboltbeing disengageable' from said means to en' cylinder, and

able withdrawal of the lock cylinder upon movement of the locking boltbeyond one of its normal limits of movement.

7. In a lock structure including a mounting head and a lock cylinderhavin key operable tumblers, the lock cylinder eing movable in themounting head yupon retraction of the tumblers, a protecting elementengaged over the exposed portion of the lock cylinder and the adjacentportion of the mounting head, and means for detachably retaining theprotecting element assembled with the mounting head comprising, alocking bolt operable upon actuation of the lock cylinder, and aconnection between theloc ing bolt and said protecting element.

8. In a lock structure including a mounting head and a key operable-lock cylinder mounted therein, a member engaged with the mounting headand the lock cylinder for removably securing the lock cylinder in themounting head, a locking bolt operable upon actuation of the lockcylinder, means whereby the locking bolt normally holds said memberassembled with the mounting head, said locking bolt being movable to aposition enabling detachment of said member from the mounting head uponmovement of the lock cylinder to a predetermined position, and keyoperable means normally preventing movement of the lock cylinder to saidpredetermined position.

9. In a lock structure including a mounting head and a key operable lockcylinder mounted therein, a member engaged over the exposed portion ofthe lock cylinder and adjacent portion of the mounting head to resistdestruction thereof, means for detachably maintaining said memberassembled with the mounting head to maintain the lock cylinder in themounting head comprising a locking bolt operable upon actuation of thelock cylinder and normally projected through an opening in said member,said locking bolt being retractible out of the member opening to enablewithdgawal of said member to permit removal of the lock cylinder uponmovement of the lock cylinder beyond one of its normal limits ofmovement, and key operable means normally preventing movement ofthe lockcylinder beyond said normal limit of movement.

10. In a lock structure including a mounting head and a key operablelock cylinder mounted therein, a protecting cap engaged over the outer`end of the lock cylinder and mounting head to removably secure the lockcylinder in the mounting head, said protecting cap having an aperture,and a locking bolt operable upon actuation of the lock cy inder andnormally projected into said aperture to hold the mounting head.

11. Infa lock structure including a mounting head and a key operablelock cylinder mounted therein, a protecting cap engaged over the outerend of the lock cylinder'and mounting head to removably secure the lockcylinder in the mounting head,` said protecting cap having an aperture,a locking bolt operable upon actuation of the lock cylinder and normallyprojected into said aperture to hold theprotecting cap on the mountinghead, said locking tractible from said aperture to release ytheprotecting cap for removal upon movement of the lock cylinder to apredetermined position, and means normally` preventing movement of thelock cylinder to said predetermined position and requiring the use of aspecial key to effect movement of the lock cylinder to saidpredetermined position.

12. In a lock structure including a mounting head anda key operable lockcylinder mounted therein, a member engaged over a portion of the lockcylinder and mounting head to removably secure the lock cylinder in themounting head, a` locking bolt operable upon actuation of the lockcylinder and normally operatively connected with said member to retainthe same assembled with the mounting head, detachment of said lockingbolt from said member being effected by movement of the lock cylinderbeyond one of its normal limits of movement, and means whereby a specialkey is required to produce such additional movement of the lockcylinder.

13. In a, lock device of the character described, including a mountingkhead having a key operable lock cylinder movable therein, a supportingelement adapted'to receive the mountin head, a locking bolt operableupon actuat1on of the lock cylinder and normally holding the mountinghead against movement in the supporting element, a protecting capengaged over the exposed portion ofthe lock cylinder and mounting headprotecting cap on the and lhaving an apertured portion through which thelocking bolt passes whereby said protecting cap is heldv assembled withthe mounting head to. removably secure the lock cylinder in position,said locking bolt being disengaged from the supporting element upon apredetermined movement of the lock cylinder' and being retracted out ofthe aperture in the protecting element upon an additional movementthereof, and means whereby a. special key is required toeiect uhadditional movement of the locking 14. In a lock structure of thecharacter described, including a mounting head and a key operable locklcylinder having a key slot mounted within the mounting head, a lockingbolt carried by the mounting head bolt being rei at the inner end of thelock cylinder, said locking bolt having a portion normally pro- -ectedthrough an opening in the mounting ead to an operative osition, alateral lug on said portion of the ocking bolt to overlie one edge ofsaid opening whereby a rocking movement of the locking bolt is requlredbefore it can be retracted into said opening, and means whereby thenormal rperation of the locking bolt by means of the lock cylinder firstimparts a rocking movement to the locking bolt and then a longitudinalmotion to retract the same within said opening.

15. In a lock structure including a mounting head and a key operablelock cylinder therein, a locking bolt having a portion normallyprojected through an opening in the mountmg head and retracted uponactuation of the lock cylinder within said opening, means for preventingretraction of the lookin bolt until the locking bolt is rocked out o itsnormal position about an axis at substantially right angles to itsdirection of retraction, and means whereby the normal operation of thelock cylinder Ieffects such rocking movement of the locking bolt.

16. In a lock structure including a mounting head and a key operablelock cyl- 3 inder rotatable therein, a locking bolt having a portionnormally projected through an opening in the mounting head andretractible within the mounting head upon actuation of the lockcylinder, means whereby rocking movement o the locking bolt about theaxis of rotation of the lock cylinder is necessary before the lockingbolt can be retracted, and means operable by the normal operation of thelocking bolt for effecting said rocking movement on the part of thelocking bolt.

17. In a lock structure including a mountin head a. lock cylinder havingkey operab e tumblers and movable in the mounting head upon retractionof the tumblers, a locking bolt havin a predetermined movement duringnorma actuation of the lock cylinder, a cooperative connection betweenthe locking bolt and the lock cylinder for removably securing the lockcylinder in the mounting head, said connection being releasable bymovement of the lock cylinder to a predetermined position beyond ltsnormal range o movement, and key operable means normally preventingmovement of the lock cylinder to said position.

In testimony whereof I have hereunto aixed my signature.

EDWARD N. JACOBI.

